Kyushu Gongda develops high-efficiency and low-cost technology for dye-sensitized solar cells

Kyushu Institute of Technology, Graduate School of Life Sciences, Professor of Early Childhood Studies

Professor Yukio Hajima, Professor of Graduate School of Life Science at the Graduate School of Kyushu Institute of Technology in Japan, delivered a speech at the seminar “Thinking about the New Direction of Organic Electronics” held on July 10-11, 2014, introducing the latest of dye-sensitized solar cells. Research and development. At present, the university is advancing multiple technological developments with the goal of improving the efficiency of dye-sensitized solar cells and reducing costs.

Dye-sensitized solar cells are solar cells that use pigments to convert solar energy into electrical energy. The use of the phenomenon that the pigment is excited by the sunlight and emit electrons. This kind of battery is expected to be manufactured at a lower cost than silicon-based solar cells, and the degree of freedom of shape and color is higher, so it may become a new generation of solar cells.

In terms of high efficiency, early adopters have listed technologies using near-infrared light. Previous dye-sensitized solar cells used ruthenium (Ru)-based pigments to obtain energy mainly from visible light having a wavelength of 400 to 700 nm. By using a mixed dye, a pigment that is excited by near-infrared light having a wavelength of 800 to 900 nm in addition to the Ru-based dye is added, and the efficiency of the battery can be improved.

In terms of cost reduction, early introduction of the back contact method is to use a transparent resin or glass instead of a high-cost transparent electrode on the surface of a solar battery cell, and a porous electrode serving as an electrode is provided on the back side thereof. metal. The specific configuration of the electrode is to apply a titanium dioxide coating on the meshed metal layer by a sputtering method to form a thin film. If the surface is covered with a transparent resin, the entire solar cell can achieve a flexible shape.

The early stage is currently developing cylindrical dye-sensitized solar cells using these technologies. Compared with flat products, cylindrical products are characterized by (1) easy installation in narrow places, (2) simple packaging, and (3) solar light that does not directly reach the unit by using a reflective plate in combination Get energy in. (Reporter: Takano Dun, Nikkei Technology)

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